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php写入、删除、复制文件及创建修改时间例子

Jun 08, 2016 pm 05:23 PM
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本文章来给大家总结一个关于php写入、删除、复制文件及创建修改时间例子,有碰到此类的同学可进入参考。

<script>ec(2);</script>

例子1:

读写文件

 代码如下 复制代码

$filename = 'txt/write.txt';
//定义要写入的内容
$content = "李先生 36 山东nr王先生 49 湖南nr孙先生 40 河北";
//使用is_writable()函数确定文件存在并且可写
if(is_writable($filename)){
//把文件写入到文件尾,应选择操作标记a
if(false == ($handle = fopen($filename, 'a'))){
echo "文件 $filename 打开失败";
exit();
}
//将$content写入打开的文件
if(fwrite($handle, $content) === false){
echo "写入文件 $filename 失败";
exit();
}
echo "写入文件 $filename 成功";
//关闭句柄
fclose($handle);
}else{
echo "文件 $filename 没有写权限";
}
?>

php写入文件例子2:

 代码如下 复制代码

$filename = "Test\file.txt";
$file = fopen($filename, "w");      //以写模式打开文件
fwrite($file, "Hello, world!n");      //写入第一行
fwrite($file, "This is a test!n");      //写入第二行
fclose($file);         //关闭文件
?>

删除文件:

 代码如下 复制代码

$filename = "Test\file.txt";
unlink($filename);    //删除文件
?>

复制文件:

 代码如下 复制代码

$filename1 = "Test\file.txt";
$filename2 = "Test\file.bak";
copy($filename1, $filename2);      //复制文件
?>

文件创建、修改、访问时间

实例

 代码如下 复制代码

$a=filectime("log.txt");
echo "创建时间:".date("Y-m-d H:i:s",$a)."
";
$a=filemtime("log.txt");
echo "修改时间:".date("Y-m-d H:i:s",$a)."
";
$a=fileatime("log.txt");
echo "访问时间:".date("Y-m-d",$a)."
";
?>

PHP fileatime()函数
定义和用法
fileatime() 函数返回指定文件的上次访问时间。

该函数返回文件上次被访问的时间。如果出错则返回 false。时间以 Unix 时间戳的方式返回。

语法
fileatime(filename)  filename 必需。规定要检查的文件。

提示和注释
提示:本函数的结果会被缓存。请使用 clearstatcache() 来清除缓存。

注释:文件的 atime 应该在不论何时读取了该文件中的数据块时被更改。当一个应用程序定期访问大量文件或目录时很影响性能。有些 Unix 文件系统可以在加载时关闭 atime 的更新以提高这类程序的性能。USENET 新闻组假脱机是一个常见的例子。在这种文件系统下,本函数没有用处

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